alarm bolt tube

例句：

1. 1. The alarm bolt tube is usedto signal danger.
   警报管用来发出危险信号。
2. 2.The alarm bolt tube was installed in thebasement for safety reasons.
   为了安全原因，在地下室安装了警报管。
3. 3. The alarmbolt tube was triggered bya sudden drop in temperature.
   温度突然下降触发了警报管。